
#ifndef PROTOCOL_MMS317_DEBUG_EN
#define MMS317_DEGUB_DATAS(str,data,len)
#else
#define MMS317_DEGUB_DATAS      DEGUB_DATAS
#endif

static unsigned short crc_ta[256]={
        0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
        0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
        0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
        0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
        0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
        0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
        0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
        0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
        0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
        0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
        0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
        0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
        0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
        0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
        0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
        0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
        0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
        0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
        0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
        0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
        0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
        0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
        0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
        0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
        0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
        0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
        0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
        0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
        0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
        0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
        0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
        0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};

static unsigned short byte_crc(unsigned char* ptr, unsigned char len)
{
        unsigned short crc;
        unsigned char da;
        crc = 0;
        while(len--!=0) {
                da=(unsigned char) (crc/256);
                crc <<= 8;
                crc ^= crc_ta[da^*ptr];
                ptr++;
        }
        return(crc);
}

char* ProtocolMMS317::checkpacket(char *buf,int lenth,int *skiplen)
{
	unsigned short crcret,crcrece;
	char *ptrbegin;
	char *ptrdatabeg;
	int packlenth,count;
/*
	if(lenth < CN_MMS317_PACKET_UART_MIN_LENGTH){
	    return NULL;
	}*/

    ptrbegin = buf;
	count = lenth;
	while(count > CN_MMS317_PACKET_PROTOCOL_MIN_LENGTH){
		if(*ptrbegin == CN_MMS317_PACKET_HEAD_FLAGAA){
		    if(ptrbegin[1] == CN_MMS317_PACKET_HEAD_FLAG55){
		        ptrdatabeg = ptrbegin + 2;
		    }else{
				count--;
				ptrbegin++;
				continue;
			}
		}else if(*ptrbegin == MCU_TO_CPU_HEADER_FLAG2){
			ptrdatabeg = ptrbegin + 1;
		}else{
			count--;
			ptrbegin++;
			continue;
		}

		packlenth = *ptrdatabeg;
		if(packlenth < CN_MMS317_PACKET_PROTOCOL_MIN_LENGTH){
			count--;
			ptrbegin++;
			continue;
		}

		if(packlenth > count){//not enough a full packet!
			*skiplen = lenth - count;
			return NULL;
		}else{
       	 	crcret = byte_crc((unsigned char *)ptrdatabeg,packlenth);
        	if(0 != crcret){
				ptrbegin++;
				count--;
				LOGOUT_E("mms317 CRC check Error!\n");
				MMS317_DEGUB_DATAS("mms317 crc check error",ptrdatabeg,packlenth);
           		continue;
        	}
			*skiplen = ptrdatabeg - buf + packlenth;
			return ptrdatabeg;//a good packet!
		}
	}

	*skiplen = lenth - count;
	return NULL;
}

int ProtocolMMS317::ProcessPacketDatas(char *buf,int length)
{
    char *packet;
    int packetlength;
    int skip,skipcounts = 0;

    while(length >= CN_MMS317_PACKET_UART_MIN_LENGTH){
        skip = 0;
        packet = checkpacket(buf,length,&skip);
        skipcounts += skip;
        if(packet != NULL){
            buf += skip;
            length -= skip;
            packetlength = *packet;
            packet -= 2;  //!!take care here ,that's while the buffer begin is 1 then 0
            packet[0] = CN_MMS317_PACKET_HEAD_FLAGAA;
            packet[1] = CN_MMS317_PACKET_HEAD_FLAG55;
            packetlength += 2;
            PutCarDatas(packet,packetlength);
        }else{
            break;
        }
    }
    return skipcounts;
}

int ProtocolMMS317::GetPacketMinLen()
{
    return CN_MMS317_PACKET_UART_MIN_LENGTH;
}

int ProtocolMMS317::GetPacketMaxLen()
{
    return CN_MMS317_PACKET_UART_MAX_LENGTH;
}

int ProtocolMMS317::mms317_init()
{
    return init(1024*8);
}



